- added documentation

diff --git a/doc/permissions.txt b/doc/permissions.txt
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+
+Non-root users can be allowed to use a config by setting ALLOW_USERS or
+ALLOW_GROUPS in the config file. For all operations to work the user must also
+be able to read and access the .snapshots directory.
+
+The .snapshots directory must have owner and group root. The directory must
+not be writable by anybody else.
+
+Example: You have a config tux for /home/tux. To allow the user tux full
+access set ALLOW_USERS="tux" in /etc/snapper/configs/tux and chmod a+rx
+/home/tux/.snapshots.
+